. >> right. the substance of his testimony was very compelling and very believable to these jurors and i think to people watching today too. but look at how the defense tried to set it up. they put these police officers first who didn't equivocate about what he said in terms of him saying no, it wasn't my son's voice. but i think the prosecutor did such an effective job of wringing out from mr. martin what an emotional moment this was for him. he just heard his son being shot and killed in that moment on that tape. and so his testimony, the substance of his testimony i think was really compelling today. >> lisa, the point faith makes, the defense called back chris serino, called back these two police officers. they gave this testimony, that basically said when we played the tape for him, he said the way they put it is he said it wasn't his son's voice. why wouldn't the defense lawyers have left it at that? when you bring in tracy martin, it actually made much more sense the way he responded. >> t